To make it a bit less off-topic you could at least mention how you ship it!
I did my second round of checking today, and now that they realize I really want to ship a real bike and they really have to look up how much that is, instead of just saying a number on the phone, the values changed a
little bit.
Deppon revised their quote to ~2300 CNY incl. insurance & box. No pick-up or delivery (costs 100 CNY more), but that's ok since I found out they are right around the corner and also in Kunming not too far, which would make crating and uncrating easier. Leadtime 6 days. I will go there on Friday to check again in person with bike.
Tianjin Train Cargo Department quotes 1800 CNY + 250 insurance + 550 box. It can't go without box. Leadtime 6 days.
Tianjin Train Checked Luggage Department says they can not transport anything over 50Kg, never could, never will and stick to the story. Maybe they thought I want to take the bike as hand baggage? I guess I will have to go there directly in person this week to check again. On Tuesday I have to ship the bike if I want to have it in Kunming in time.
The involved budget changed, but now I have to walk the walk. Not sure where the past prices came from, I already gave them size, weight and destination before... but I live here long enough to not be surprised that much.
Alternative might be renting a (legal) bike in Kunming for the trip, but I don't really want that. We will see.